Sagot :
The correct answer is the option D.
As the United States entered the World War II they have started developing nuclear projects under the orders of the president Harry Truman. WW2 represented a massive arms race and president Truman believed that the Nazis have started developing a nuclear bomb, so he ordered that the US began the same project immediately in hopes of finishing before the Nazis.
(D) US entry into World War II.
Further Explanation:
United States took over to the Atomic research during the Second World War so to nurture the development of atomic science and technology. (AEC) or United States Atomic Energy Commission was an administrative organization of the US,organized to control the advancement of technology and atomic science. The research was commenced not only for nuclear weapons for the nation's protection but also for the improvement of public welfare and it's firming up in private enterprises.
The project started somewhat during 1939 through the commencement of the Manhattan Project. Manhattan Project was a research project of the Second World War that gave the world its first nuclear armament. It was a joint venture of the United States, Britain, and Canada under the administration of Major General Leslie Groves, engineer of US Army corps. Robert Oppenheimer a Nuclear Physicist was hired as the director of Los Alamos Laboratory, where the bomb was assembled. Two types of nuclear bombs were made during the war namely complex implosion-type atomic weapons and a gun-type fission weapon.
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Answer Details
Grade: High School
Subject: History
Chapter: Manhattan Project
Keywords:Woodrow Wilson, Henry Cabot Lodge, President, United States, Senate, Paris peace treaty, Committee, Funeral, World War I, President Wilson offended members of the US Senate